Khumayr bin Malik reported,
He ordered that the copies of the Quran be changed. Ibn Masud said, "Whoever among you can hide his copy away, let him hide it, for whoever conceals something will bring it on the Day of Resurrection."Then he said, "I recited seventy surahs directly from the mouth of the Messenger of Allah ﷺ. Shall I abandon what I took from the very mouth of the Messenger of Allah ﷺ?"
Ahmad 3929
Sahihحدثنا أسود بن عامر أخبرنا إسرائيل عن أبي إسحاق
عن خمير بن مالك قال
أمر بالمصاحف أن تغير قال قال ابن مسعود من استطاع منكم أن يغل مصحفه فليغله فإن من غل شيئا جاء به يوم القيامة قال ثم قال قرأت من فم رسول الله ﷺ سبعين سورة أفأترك ما أخذت من في رسول الله ﷺ
No references are available.
Its isnad is sahih. Ibn Kathir related this hadith in his tafsir, 2:284, quoting it from this same passage. Ibn Abu Dawud also related it in Masahif, 15, through the route of Israil.Khumayr, with damma on the dotted kha, fatha on the mim, and ending in ra, its authentication has already been given at 3697. It occurs in Ibn Kathir as "al-Jubayr" and in the book of Ibn Abu Dawud as "al-Humayd," but both are corruptions.This incident came from Ibn Masud when Uthman 
ordered the people to be gathered around the single authoritative copy of the Quran, fearing their disagreement over it, and Ibn Masud grew angry at this. When he saw it, may Allah have mercy on him, he protested strongly, going to him and saying, "By what I see, it is the foreign scribes who have betrayed you."The verse is clear in its meaning, carrying a warning against whoever betrays or embezzles from the spoils of war.Ibn Saad related its meaning at length in Tabaqat, 2/2/105, through the route of Amash, from Abu Waail, from Ibn Masud. See 3846, 3906.